Absorption type grading heat supply system

Abstract

The invention provides an absorption type grading heat supply system, belonging to the technical field of waste heat utilization and heat pump / refrigeration. A first generator, a first absorber, a first condenser, a first evaporator, a first solution pump, a first throttle valve, a first solution heat exchanger, a newly-added generator, a newly-added absorber, a newly-added solution pump and a newly-added solution heat exchanger form a primary heat medium heating process; a second generator, a third generator, a second absorber, a third absorber, a second condenser, a second evaporator, a second solution pump, a third solution pump, a second throttling valve, a second solution heat exchanger and a third solution heat exchanger form a secondary heat medium heating process; and a primary heat medium flows through the secondary heat medium heating process and provides a drive heat load and a low-temperature heat load, and a circulating pump realizes primary heat medium circulating flowing. Corresponding parts are additionally provided, thus a series of absorption type grading heat supply systems are obtained.

Description

Technical field: [0001] The invention belongs to the technical field of low-temperature waste heat utilization and heat pump / refrigeration. Background technique: [0002] In systems that use the sensible heat of hot fluid (such as hot water) as the heat load transport method and use long-distance heat transport, a two-stage or multi-stage heating system is required. Taking the large-scale combined heat and power system for heating in winter as an example, the heating temperature of the primary heating pipe network is high, and there is a large heating temperature difference between the primary heat medium and the secondary heat medium. For example, the supply and return of the primary pipe network The water temperature is 135°C / 65°C, the supply and return water temperature of the secondary pipe network is 70°C / 55°C, and the average temperature difference between the two exceeds 35°C. From the perspective of rational use of heat energy, the existence of a large temperature d...

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Problems solved by technology

From the perspective of rational use of heat energy, the existence of a large temperature difference is unreasonable; at this time, if the heating of the first-stage heat medium is completed by simply relying on the steam extraction in the middle of the high-pressure steam turbine, there will also be a large temperature difference, which is also unreasonable. Reasonable; in addition, in the traditional large-scale combined heat and power system, a large amount of latent heat contained in the exhaust steam at the outlet of the steam turbine cannot be utilized

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